Heart & Mediastinum

Question 1

5 year old fatigues easily. On examination a machinery like murmur is auscultated over his chest. Echocardiography shows shunting of blood from the aorta to the pulmonary artery. An abnormality involving which of the following structures is most likely present in this boy?

Answer 1

Ductus Arteriosus

Question 2

1 month old infant has failure to thrive. On exam a heart murmur is auscultated over the chest. No cyanosis is noted. Echo shows a left to right shunt superior to the muscular interventricular septum. An abnormality of which of the following structures most likely produced this infant’s defect?

Answer 2

Septum primum

Question 3

The period of lung development in which NO respiratory bronchioles or alveoli have yet formed is known as

Answer 3

Pseudoglandular period

Question 4

The smooth muscle in the wall of the respiratory tract is derived from

Answer 4

Splanchnic (visceral) mesoderm

Question 5

Which of the following shunts blood from the R atrium to the L atrium?

Answer 5

Foramen ovale